The noble metals

A. Are exemplified by Na, K and Li

B. Do not resist corrosion very strongly

C. Are the lowermost in the electro-chemical series of metals

D. None of these

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  1. Which of the following metals is the most prone to work hardening?
  2. Which of the following metals reacts violently with water?
  3. Friction factor for fluid flow in pipe does not depend upon the
  4. Upto the critical radius of insulation, added insulation, will
  5. Ultimate strength in tension as compared to that in shear for steel is
  6. With increase in temperature, the electrical conductivity of semiconductors
  7. Thermit welding uses the following energy source.
  8. In a boundary layer developed along the flow, the pressure decreases in the downstream direction. The…
  9. Which of the following is not a charge material for cupola?
  10. The emf of a Deniell cell Zn | Zn2+ || Cu2+ | Cu can be increased by
  11. The mechanism involved in the removal of metal in drilling operation is by
  12. The pressure outside a bubble/droplet of liquid is __________ the internal pressure.
  13. Wavelength of radiation emitted by a body depends on the __________ of its surface.
  14. Diameter of the rivet to be provided on a 20 mm. thick boiler plate will be __________ mm.
  15. Projection welding & stud welding is categorised as the __________ welding.
  16. The main reducing agent in iron blast furnace is
  17. __________ iron is produced by the annealing of white cast iron.
  18. Which of the following is resistant to the action of both heat & chemicals?
  19. Hooke's law
  20. Change in volume of metals from absolute zero temperature to their melting points is
  21. With decrease in the grain size of a material, its creep resistance
  22. Electrical conductivities of semi-conductors are of the order of __________ ohm/cm.
  23. Thermal efficiency of an internal combustion engine is around __________ percent.
  24. __________ is not a heat treatment process.
  25. Insulation of liquid surface can be achieved by __________ on top of its surface.
  26. Neutrons are present in all atoms except that of
  27. Dies for wire drawing are generally made of
  28. The leaching solvent used in Baeyer's process for the purification of bauxite is
  29. The life of a ball bearing is inversely proportional to
  30. Energy of the sun arises mainly from __________ reactions.